FR864040A - Improvements in cathodes for electric discharge devices - Google Patents

Improvements in cathodes for electric discharge devices

Info

Publication number
FR864040A
FR864040A FR864040DA FR864040A FR 864040 A FR864040 A FR 864040A FR 864040D A FR864040D A FR 864040DA FR 864040 A FR864040 A FR 864040A
Authority
FR
France
Prior art keywords
cathodes
electric discharge
discharge devices
devices
electric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of FR864040A publication Critical patent/FR864040A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/024—Electron guns using thermionic emission of cathode heated by electron or ion bombardment or by irradiation by other energetic beams, e.g. by laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Solid Thermionic Cathode (AREA)
  • X-Ray Techniques (AREA)
  • Electron Tubes For Measurement (AREA)
FR864040D 1939-01-25 1940-02-27 Improvements in cathodes for electric discharge devices Expired FR864040A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2528/39A GB524240A (en) 1939-01-25 1939-01-25 Improvements in or relating to cathodes for electron discharge devices
GB1257939 1939-04-27

Publications (1)

Publication Number Publication Date
FR864040A true FR864040A (en) 1941-04-22

Family

ID=9741152

Family Applications (1)

Application Number Title Priority Date Filing Date
FR864040D Expired FR864040A (en) 1939-01-25 1940-02-27 Improvements in cathodes for electric discharge devices

Country Status (4)

Country Link
US (1) US2239416A (en)
FR (1) FR864040A (en)
GB (1) GB524240A (en)
NL (1) NL60423C (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443324A (en) * 1942-11-07 1948-06-15 Charles Schiffman Electronic tube
US2423998A (en) * 1943-04-30 1947-07-15 Farnsworth Television & Radio Electron discharge device
US2852685A (en) * 1945-01-26 1958-09-16 John R Tolmie Ion source for calutrons
GB624832A (en) * 1947-07-10 1949-06-16 Cinema Television Ltd Improvements in or relating to circuits for cathode ray tubes and methods of operating the same
US2552047A (en) * 1949-04-19 1951-05-08 Rca Corp Electron discharge device with temperature-stabilized cathode
US2635207A (en) * 1950-12-01 1953-04-14 Bell Telephone Labor Inc Electron discharge device of the cavity resonator type
US2928972A (en) * 1954-04-09 1960-03-15 Varian Associates Electron tube apparatus
US2815465A (en) * 1955-05-31 1957-12-03 Raytheon Mfg Co Heater assemblies for vacuum tubes
US2912616A (en) * 1956-02-07 1959-11-10 Itt Pulsed-cathode electron gun
US3441767A (en) * 1967-02-01 1969-04-29 Sylvania Electric Prod Tensioned directly heated cathode having improved temperature characteristics
US3777200A (en) * 1971-05-14 1973-12-04 Nasa High powered arc electrodes
WO2008047269A2 (en) * 2006-10-17 2008-04-24 Philips Intellectual Property & Standards Gmbh Emitter for x-ray tubes and heating method therefore
JP2010251718A (en) * 2009-03-27 2010-11-04 Canon Anelva Corp Temperature control method for heating apparatus, and storage medium
US9251987B2 (en) 2012-09-14 2016-02-02 General Electric Company Emission surface for an X-ray device
CN211238153U (en) * 2020-03-20 2020-08-11 西门子爱克斯射线真空技术(无锡)有限公司 X-ray tube and X-ray imaging apparatus

Also Published As

Publication number Publication date
GB524240A (en) 1940-08-01
NL60423C (en) 1948-01-15
US2239416A (en) 1941-04-22

Similar Documents

Publication Publication Date Title
FR864040A (en) Improvements in cathodes for electric discharge devices
FR51138E (en) Improvements to thermionic discharge devices
FR837898A (en) Electric discharge tube
FR863046A (en) Improvements to discharge device circuits
FR860921A (en) Neutralizer for electric accumulators
FR921948A (en) Luminescent coating for electric discharge devices
FR930734A (en) Electric discharge devices
FR864535A (en) electrodes for electric discharge lamps
FR844392A (en) Electric discharge devices
FR841336A (en) Electric discharge devices
FR861887A (en) electrode for electric discharge tubes
FR950547A (en) Electric discharge lamp
FR859559A (en) electrode for electrolytic devices
FR842012A (en) Electric discharge vessel
FR863184A (en) Improvements to discharge devices
FR867748A (en) Improvements to electric discharge lamps
FR875748A (en) Cathode for electric discharge tubes
FR784018A (en) Electrode construction for electric discharge devices
FR881209A (en) electrode for electric discharge vessel
FR867434A (en) Improvements to electric discharge tubes
FR867490A (en) Improvements to reactance coils in particular for electric discharge lamps
FR886526A (en) Electric discharge lamp
IE15495L (en) Electric discharge device electrodes
FR842089A (en) Luminescent materials for electric discharge receptacles
CA379891A (en) Electric discharge device